STUDY ON STRENGTH OF CONCRETE USING VARIOUS COARSE AGGREGATES, PART-21

CHAPTER – 7 DISCUSSION

The following conclusion may be drawn from the experimental
investigation. In this study, the strength of concrete varied with changing
coarse aggregate in constant mix proportion. The design strength was 2800 psi
but the experimental result shows that

•
For compressive strength

Types of coarse aggregate

Average
strength (psi)

Stone chips

2135.33

Brick chips

2229.67

So the ratio of the average strength
of coarse aggregate is

Stone
chips: Brick chips = 2135.33: 2229.67

= 1: 1.05

•
For tensile strength

Types of coarse aggregate

Average
strength (psi)

Stone
chips

143.33

Brick chips

166.33

So the ratio of the average strength
of coarse aggregate is

Stone
chips: Brick chips = 143.33: 166.33

= 1: 1.16

•
For flexural strength

Types of coarse
aggregate

Average strength (psi)

Stone chips

525

Brick chips

450

So the ratio of the average strength
of coarse aggregate is

Stone
chips: Brick chips = 525: 450

=
1: 0.86

•
For shear strength

Types of
coarse aggregate

Average
strength (psi)

Stone chips

98.33

Brick chips

84.5

So the ratio of the average strength
of coarse aggregate is

Stone chips:
Brick chips = 98.33: 84.5

= 1: 0.86

There are some limitations and
difficulties which are as follows:

(1)Compaction was done by tamping rod.
At the time of compaction a little quantity of water was forced out of the
mould that reduced the required quantity of water.

(2)Twelve cylinders and six beams were
tested. We think if we would increase the number of test specimens that would
certainly give more accurate results.